The newest Milwaukee 12V Lithium-Ion Battery works on the M12™ Cordless Tool System and has 4.0 Amp Hours of run-time. Milwaukee’s M12™ REDLITHIUM™ XC4.0 provides up to 2X more run-time, 20% more power and 2X more recharges than a standard Lithium-Ion battery. REDLITHIUM™ XC4.0 also delivers best-in-class performance in extreme job-site conditions. With Milwaukee® durability built into each pack, the REDLITHIUM™ XC4.0 battery operates cooler and performs in climates below -18C/0F with fade free power. Show More